This package installs stuff in the vendor_perl directory and knows
about the Perl version. Instead of baking the version number into the
PLIST, control it from the Makefile. Also, depend on the current
major/minor version of Perl. Ideally this version should come from
something in lang/perl5, but there isn't any obvious way to do that.
But at least now this only has to be updated in one place when Perl
changes.

Bump PKGREVISION because of the depends changes.

(dholland)